Title:
BRANCH CIRCUIT AND RF CIRCUIT MODULE
Document Type and Number:
WIPO Patent Application WO/2013/099568
Kind Code:
A1
Abstract:
A branch circuit (10) is provided with a transmission filter (11) and a reception filter (12). The transmission filter (11) is connected between a transmission-signal input terminal (Ptx) and an antenna-connection terminal (Pant). The reception filter (12) and a first phase-shift circuit (21) and second phase-shift circuit (22) are serially connected between the antenna-connection terminal (Pant) and a reception-signal output terminal (Prx). A first amplitude-adjustment circuit (31) and a second amplitude-adjustment circuit (32) are serially connected between the antenna-connection terminal (Pant) and the reception-signal output terminal (Prx). The connection point of the first amplitude-adjustment circuit (31) and the second amplitude-adjustment circuit (32) is connected to the connection point of the first phase-shift circuit (21) and the second phase-shift circuit (22). At the first and second phase-shift circuits (21, 22), the phase of the transmission signal that leaks to the reception side and must be canceled out is adjusted, and at the first and second amplitude-adjustment circuits (31, 32) the amplitude of the transmission signal for balancing is adjusted.
Inventors:
UEJIMA TAKANORI (JP)
TAKEUCHI MORIO (JP)
TAKEUCHI MORIO (JP)
Application Number:
PCT/JP2012/081878
Publication Date:
July 04, 2013
Filing Date:
December 10, 2012
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H7/46; H04B1/40; H03H9/64; H03H9/72; H04B1/10
Domestic Patent References:
| WO2009025106A1 | 2009-02-26 |
Foreign References:
| JP2008278417A | 2008-11-13 | |||
| JP2011171922A | 2011-09-01 | |||
| JPH0879126A | 1996-03-22 |
Attorney, Agent or Firm:
Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
Patent business corporation Kaede Patent Attorneys' Office (JP)
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